#include <REGX52.H>
void Delay(unsigned int xms)		//@11.0592MHz
{
	unsigned char i, j;
	while(xms--)
	{
		i = 2;
		j = 199;
		do
		{
			while (--j);
		} while (--i);
	}	
}


void main()
{
	unsigned char LEDNum=0;
	while(1)
	{
		if(P3_1==0)
		{
			Delay(20);
			while(P3_1==0);
			Delay(20);
//			//1111 1111
//			P2++;//0000 0000
//			P2=~P2;//1111 1111
			LEDNum++;
			P2=~LEDNum;
			//P2--;
			
		}
	}
		
}
